YARN-11888. Serve the Capacity Scheduler UI.

[brumi1024]

Description of PR

Expose the Capacity Scheduler UI, similar to UI2.

How was this patch tested?

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 25s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 3s		No case conflicting files found.
+0 🆗	codespell	0m 3s		codespell was not available.
+0 🆗	detsecrets	0m 3s		detect-secrets was not available.
+0 🆗	shelldocs	0m 3s		Shelldocs was not available.
+0 🆗	xmllint	0m 0s		xmllint was not available.
+0 🆗	markdownlint	0m 0s		markdownlint was not available.
+0 🆗	jsonlint	0m 0s		jsonlint was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 1s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+0 🆗	mvndep	7m 18s		Maven dependency ordering for branch
+1 💚	mvninstall	16m 15s		trunk passed
+1 💚	compile	9m 5s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	9m 21s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	1m 28s		trunk passed
-1 ❌	mvnsite	5m 22s	/branch-mvnsite-root.txt	root in trunk failed.
+1 💚	javadoc	5m 9s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	4m 52s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+0 🆗	spotbugs	0m 15s		branch/hadoop-assemblies no spotbugs output file (spotbugsXml.xml)
-1 ❌	spotbugs	7m 31s	/branch-spotbugs-hadoop-yarn-project_hadoop-yarn-warnings.html	hadoop-yarn-project/hadoop-yarn in trunk has 4206 extant spotbugs warnings.
-1 ❌	spotbugs	1m 24s	/branch-spotbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-api-warnings.html	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api in trunk has 87 extant spotbugs warnings.
-1 ❌	spotbugs	1m 13s	/branch-spotbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-common-warnings.html	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common in trunk has 1100 extant spotbugs warnings.
-1 ❌	spotbugs	1m 25s	/branch-spotbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager-warnings.html	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager in trunk has 1299 extant spotbugs warnings.
-1 ❌	spotbugs	6m 53s	/branch-spotbugs-hadoop-yarn-project-warnings.html	hadoop-yarn-project in trunk has 4206 extant spotbugs warnings.
-1 ❌	spotbugs	19m 20s	/branch-spotbugs-root-warnings.html	root in trunk has 9242 extant spotbugs warnings.
+1 💚	shadedclient	33m 51s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 20s		Maven dependency ordering for patch
+1 💚	mvninstall	20m 30s		the patch passed
+1 💚	compile	9m 46s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	9m 46s		the patch passed
+1 💚	compile	9m 43s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	9m 43s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	1m 42s	/results-checkstyle-root.txt	root: The patch generated 1 new + 242 unchanged - 0 fixed = 243 total (was 242)
-1 ❌	mvnsite	3m 57s	/patch-mvnsite-root.txt	root in the patch failed.
+1 💚	shellcheck	0m 0s		No new issues.
-1 ❌	javadoc	5m 23s	/results-javadoc-javadoc-root-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04.txt	root-jdkUbuntu-21.0.7+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 generated 5 new + 46254 unchanged - 0 fixed = 46259 total (was 46254)
-1 ❌	javadoc	4m 41s	/results-javadoc-javadoc-root-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04.txt	root-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04 with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04 generated 5 new + 43037 unchanged - 0 fixed = 43042 total (was 43037)
+0 🆗	spotbugs	0m 12s		hadoop-assemblies has no data from spotbugs
+0 🆗	spotbugs	0m 14s		hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui has no data from spotbugs
+1 💚	shadedclient	32m 39s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	222m 39s	/patch-unit-root.txt	root in the patch failed.
-1 ❌	asflicense	0m 43s	/results-asflicense.txt	The patch generated 4 ASF License warnings.
		449m 29s

Reason	Tests
Failed junit tests	hadoop.yarn.server.nodemanager.containermanager.logaggregation.TestLogAggregationService
	hadoop.security.ssl.TestDelegatingSSLSocketFactory
	hadoop.hdfs.tools.TestDFSAdmin

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8082/2/artifact/out/Dockerfile
GITHUB PR	#8082
Optional Tests	dupname asflicense codespell detsecrets shellcheck shelldocs compile javac javadoc mvninstall mvnsite unit shadedclient xmllint spotbugs checkstyle markdownlint jsonlint jshint
uname	Linux 94384b6bf6cf 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 072724d
Default Java	Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8082/2/testReport/
Max. process+thread count	4120 (vs. ulimit of 5500)
modules	C: hadoop-assemblies hadoop-yarn-project/hadoop-yarn hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui hadoop-yarn-project . U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8082/2/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7 shellcheck=0.7.0
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[K0K0V0K]

Hi @brumi1024 !

Thanks for this new feature, seems very fascinating.
All seems good, i just have one NIT:
Maybe we should extend the LICENSE-binary with the React and Tailwind licence?

[brumi1024]

Thanks @K0K0V0K! Good point, I've added the missing licenses to the original PR: #8076. Will rebase this one once that get's a green build.

[zeekling]

why version is committer id?

[brumi1024]

It's a temporary workaround, the PR is to big, without this Yetus won't build it. It can be reverted after a successful build.

[zeekling]

Why use a personal repository?

[brumi1024]

Same as above.